Laravel eloquent sort by role name on relationship model

问题

I'm stuck with a problem where I have to sort / order a collection of models by their relationship's data.

I've got it setup like this:

Models: User, Team, TeamUser, Role

The TeamUser model is a pivot model / table (containing user_id and team_id. If it's worth mentioning I am also using spatie/laravel-permissions for the roles.

How would I go forth when I want to sort the users in a team by their role.name? I'm talking about the users() relation in the Team model (see further down for code sample). Some users have the role team-leader and most have the role team-seller. I've tried doing a ordinary ..->sortBy('role.name') but that doesn't seem to work. Thanks in advance if anyone could help me out.

User.php

/**
 * Team relation
 *
 * @return \Illuminate\Database\Eloquent\Relations\BelongsToMany
 */
public function team()
{
    return $this->belongsToMany('App\Team', 'team_users', 'user_id', 'team_id');
}

Team.php

/**
 * User relation
 *
 * @return \Illuminate\Database\Eloquent\Relations\BelongsToMany
 */
public function users()
{
    return $this->belongsToMany('App\User', 'team_users', 'team_id', 'user_id')->withTimestamps();
}

回答1:

if you want to order the result based on nested relation column, you must use a chain of joins:

$values = Team::query()
      ->leftJoin('users', 'users.team_id', '=', 'teams.id')
      ->leftJoin('model_has_roles', function ($join) {
          $join->on('model_has_roles.model_id', '=', 'users.id')
               ->where('model_has_roles.model_type', '=', 'app\Models\User');
      })
      ->leftJoin('roles', 'roles.id', '=', 'model_has_roles.role_id')
      ->orderBy('roles.name')
      ->get();

i have tried it, it work just fine.

please note that if you want to order by multiple columns you could add 'orderBy' clause as much as you want:

->orderBy('roles.name', 'DESC')->orderby('teams.name', 'ASC') //... ext

来源：https://stackoverflow.com/questions/61190637/laravel-eloquent-sort-by-role-name-on-relationship-model

标签

php

laravel

eloquent

relationship